Metal-turning lathe



(No Moaei.) y

` W. P. BARNES..v

METAL TURNING LATHE.

Patented Feb. l5, 1887.

UNITED STATES W'ILLIAM F. BARNES, OF ROCKFORD, ILLINOIS.

METAL-TURNING LATHE.

SPECIFICATION @rming part of Letters Patent No. 357,567, dated Februaryl5, 1887.

Application inea .my s, ieee.

To all whom it may concern.-

Be it known that I, WILLIAM F. BARNES, a citizen of the United States,residing in the city of Rockford, in the county of Winnebago i and Stateof Illinois, have invented a new and tion, will be hereinafter morefully described.

In the drawings, Figure 1 is a side elevation of portions of a latheembodying my invention. Fig. 2 is an elevation of the head end ofthelathe. 'Fig 3 shows the gear-connection of the twin feed-screws. Fig. 4is a transverse section on dotted line ct of Fig. 1; and Fig. 5 is anisometrical representation of the semi screw-nut to the twin screws, itssupports, and its operating mechanism, in which portions are shown insection.

The several portions, consisting of the bed 1, head-block 2, with itsspindle, cone-pulley, back gear, and gear-train connection with thefeed-screw, the tool-carriage 3, with its toothgear connection with thebed and its toolholder and transverse feed, and the tail-block 4 and itsspindle, are substantially the same and operate in the same manner andfor the same purpose as like parts of lathes heretofore in use. Likefeed-screws 5 and 6 are placed on the side of the lathe-bed parallelwith the ways, and are supported to revolve in end bearings. The twinscrews 5 and 6 are connected to revolve in opposite directions by meansof like gear-wheels 7 and 8,1'1Xed to the screws in such a manner thattheir gear-teeth shall engage each other in working contact.

A gear-wheel, 9, is fixed on the projecting end portions of the screw 5,outside ofthe gearwheels fixed on the screws, and an intermediategear-wheel, 10, on stud-bearing connects Serial No. 207,110. (No model.)

the gear-wheel 9. and agear-pinion, 11, on the A nut, 14, placed betweenthe screws, andenpable of a sliding movement in its grooved connectionwith the jaws, to engage either of the screws, or to be placed betweenthem, detached from both. rIhe slide-bearing 12, with semi screw-nut inplace therein, is placed on the twin screws, and is removably ixed tothe inner face of the depending face-plate 15 of the tool-carriage.

A shaft, 16, is supported to oscillate or rotate in a bearing formed inthe face-plate of the tool-carriage and in the sliding bearing fixed toits inner face, and a stud-pin, 17, projecting eccentrically from itsinner end enters a slot-opening, 18, formed lengthwise in the inner faceof the semi screw-nut. The shaft 16 is provided with an annular groove,19, and at equal annular intervals in the groove,on opposite sides ofthe shaft, are formed conic depressions 20,'to receive aeonicspring-actuated detent, 21, to hold the shaft in its adjustments ina manner to permitit to be turned in either direction to any of thedivisions of the conic depressions, and also to permit it to bewithdrawn from its bearing. The shaft 16 is provided with alever-handle, 22, by means of which it may be turned, withdrawn, orreplaced. In this instance the relative position of the lever-handle,the conic depressions in the shaft, the detent, and the eccentricstudpin in its connection with the semi screw-nut is such that when thelever is turned from its horizontal position toward the tail end of thelathe, as shown in the solid lines in Figs. 1 and 2, the semi screw-nutwill be depressed in working contact with the lower feed-screw, 6, asshown in Fig. 2, and in the movements of the lathe the carriage willmove toward the tail end of the lathe, as indicated by the arrow. Vhenthe lever is turned to the hori- IOO the head of the lathe, the semiscrew-nut will be raised to engage the upper feed-screw in workingcontact, as in the dotted lines in Fig. 4, and in the movements of thelathe the car riage will move toward the head of the lathe, as indicatedby the arrow on its dotteddine position of the lever on Fig. l.

From the foregoing it will be seen that the position of the lever towardthe head or tail ends of the lathe indicates the direction of movementof the carriage.

When the lever-handle 22 is in its vertical position, either up or down,as shown in dotted lines on Fig. l, the semi screw-nut will bedisengaged from the feed-screw and the carriage will be free to be movedin either direction on the ways by means of its rack-andpinionconnection.

In the employment of twin feed-screws re volving in opposite directions,I obtain a backand-forth movement of the carriage without reversing themovement of the feedscrew or head-spindle or shifting of thedriving-belts.

Instead of the like feed screws moving in opposite directions, aright-hand and left-hand screw moving in the same direction may beemployed, and the lever-handle of the shaft employed to operate the semiscrew-nut may be adjustable in any position relatively with the movementof the tool-carriage and still be within the scope of my invention.

I claim as my inventionl. In a lathe, the combination, with the parallelscrews substantially identical in construction, having a gear-connectionwith the headspindle, and so geared with each other as to rotate inopposite directions, of the tool-carriage and mechanism for throwingeither of said screws into engagement with the carriage to reverse themovement of the latter without reversing the movemnt of the screws,substantially as set forth.

2. The combination, with twin feed-screw and with a screw-nut to engagethe screws, ofan eccentric to operate the screw-nut, substantially asand for the purpose set forth.

3. The combination, with the eccentric to operate the screw-nut, of adetent to hold the screw nut in its adj usted position, substantially asand for the purpose set forth.

VILLIAM F. BARNES.

Witnesses:

FRANK E. HUMEs'roN, A. O. BEHEL.

